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In how many ways can 21 identical books on Tamil and 19 identical

books on English be placed in a row on a shelf so that two books on
English may not be together?


29 i think that should be it
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Using permutations and combinations  and method of gaping
so there are 22 spaces between the 21 tamils books and there are 19 English books
 are identical  so it must be identified as  1 objest can be arrange there ²²P₁ = 22  ways
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